Integrated Electricity Heating Security Region Construction
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Solution Overview
Problem
Existing methods for constructing a security region in integrated electricity and heating systems lack accuracy due to oversimplification and neglect of thermal dynamics, making them unsuitable for online analysis and prone to cascade faults.
Innovation Solution
A dynamic model is established for the integrated system, incorporating power and heating system models, with operational security constraints, and a concave hull method is used to solve for the security region boundary, considering nonlinear and nonconvex characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traversal simulation method is used to construct security region, then comprehensive analysis can be performed, but it needs to generate enough scenarios which is not suitable for online analysis
Solution Approach 1:
The patent pre-generates a set of representative operating scenarios and uses them to construct the security region boundary in advance. This preliminary action allows the system to have a pre-computed security region that can be quickly queried during online operation without requiring real-time scenario generation, thus achieving both accuracy and speed.
Solution Approach 2:
The patent creates a simplified mathematical representation (copy) of the complex security region through hyperplane fitting. Instead of storing or computing all possible scenarios, it uses a compact mathematical model that approximates the security region boundary, enabling fast online queries while maintaining reasonable accuracy.
2Productivity
If hyperplane fitting method is used to construct security region, then computational efficiency is improved, but the model needs to be simplified greatly and the accuracy of the result is low
Solution Approach 1:
The patent introduces thermal dynamics into the security region construction by incorporating time-varying thermal states and thermal constraints. The security region is constructed to account for thermal inertia, temperature constraints, and heat transfer dynamics, making the region adaptive to changing thermal conditions while maintaining computational efficiency through structured modeling approaches.
Solution Approach 2:
The patent changes the parameter representation by including thermal parameters (temperatures, heat flows, thermal states) alongside traditional power system parameters. This allows the security region to accurately reflect the coupled electro-thermal nature of the system without requiring excessive simplification, achieving both efficiency and accuracy.
3Ease of manufacture
If existing research methods are used, then construction process is simplified, but thermal dynamics is ignored which leads to further reduction of accuracy
Solution Approach 1:
The patent segments the complex coupled electro-thermal system into distinct but interconnected modules: power system models, heating system models, and combined heat and power unit models. Each module is modeled separately with appropriate dynamics, then integrated through coupling constraints. This segmentation makes the construction process manageable while preserving thermal dynamics accuracy.
Solution Approach 2:
The patent creates a composite modeling framework that combines power system models with heating system models. This composite approach integrates electrical and thermal domains while maintaining the distinct characteristics of each system, allowing accurate representation of thermal dynamics without overwhelming complexity in the construction process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method accurately depicts the operational features of the integrated system, ensuring absolute security by accounting for thermal dynamics and providing a robust framework for operational analysis.
Implementation Method 1
a dynamic model of a quality-regulated heating system model established based on pipe heat transfer
Implementation Method 2
node heat exchange
Implementation Method 3
a dynamic model of a combined heat and power unit constructed based on production capacity of the combined heat and power unit
Data Source
AI summary
Disclosed is a method for constructing a security region of an integrated electricity and heating system, falling into the field of energy system modeling and operational analysis. The method specifically includes: establishing a dynamic model of the integrated electricity and heating system, including a power system model, a quality-regulated heating system dynamic model, and a combined heat and power unit dynamic model; constructing, in combination with operational security constraints, a security region model of the integrated electricity and heating system considering thermal dynamics; and solving, aiming at nonlinear and nonconvex characteristics of the security region of the integrated electricity and heating system, a security region boundary by an optimization-check-based concave hull method. Compared with the related art, the method considers thermal dynamics in the integrated electricity and heating system, and accurately depicts operational features. Limited operation points are solved through the optimization-check-based concave hull method, thus guaranteeing security.